Finding the Fourth Proportional to 379,642,085.37, 523,906,846.85 and 212,381,139.78

Step by Step Solution

1. Step 1: Write the proportion equation
   379,642,085.37 : 523,906,846.85 = 212,381,139.78 : x
2. Step 2: Convert to fraction form
   379,642,085.37/523,906,846.85 = 212,381,139.78/x
3. Step 3: Cross multiply
   379,642,085.37x = 523,906,846.85 × 212,381,139.78
4. Step 4: Simplify right side
   379,642,085.37x = 111,267,933,273,079,856
5. Step 5: Solve for x
   x = 111,267,933,273,079,856/379,642,085.37
6. Step 6: Final answer
   x = 293,086,403.12