Finding the Fourth Proportional to 378,086.01, 521,770.52 and 216,970.53

Step by Step Solution

1. Step 1: Write the proportion equation
   378,086.01 : 521,770.52 = 216,970.53 : x
2. Step 2: Convert to fraction form
   378,086.01/521,770.52 = 216,970.53/x
3. Step 3: Cross multiply
   378,086.01x = 521,770.52 × 216,970.53
4. Step 4: Simplify right side
   378,086.01x = 113,208,826,262.78
5. Step 5: Solve for x
   x = 113,208,826,262.78/378,086.01
6. Step 6: Final answer
   x = 299,426.12