Finding the Fourth Proportional to 100,906.88, 139,267.89 and 58,490.01

Step by Step Solution

1. Step 1: Write the proportion equation
   100,906.88 : 139,267.89 = 58,490.01 : x
2. Step 2: Convert to fraction form
   100,906.88/139,267.89 = 58,490.01/x
3. Step 3: Cross multiply
   100,906.88x = 139,267.89 × 58,490.01
4. Step 4: Simplify right side
   100,906.88x = 8,145,780,278.78
5. Step 5: Solve for x
   x = 8,145,780,278.78/100,906.88
6. Step 6: Final answer
   x = 80,725.72