Finding the Fourth Proportional to 521,086.56, 719,112.24 and 291,642.06

Step by Step Solution

1. Step 1: Write the proportion equation
   521,086.56 : 719,112.24 = 291,642.06 : x
2. Step 2: Convert to fraction form
   521,086.56/719,112.24 = 291,642.06/x
3. Step 3: Cross multiply
   521,086.56x = 719,112.24 × 291,642.06
4. Step 4: Simplify right side
   521,086.56x = 209,723,375,044.81
5. Step 5: Solve for x
   x = 209,723,375,044.81/521,086.56
6. Step 6: Final answer
   x = 402,473.20