Finding the Fourth Proportional to 681,200.72, 1,021,792.86 and 207,887.42

Step by Step Solution

1. Step 1: Write the proportion equation
   681,200.72 : 1,021,792.86 = 207,887.42 : x
2. Step 2: Convert to fraction form
   681,200.72/1,021,792.86 = 207,887.42/x
3. Step 3: Cross multiply
   681,200.72x = 1,021,792.86 × 207,887.42
4. Step 4: Simplify right side
   681,200.72x = 212,417,881,439.82
5. Step 5: Solve for x
   x = 212,417,881,439.82/681,200.72
6. Step 6: Final answer
   x = 311,828.62