Finding the Fourth Proportional to 287,871.54, 431,856.51 and 98,321.51

Step by Step Solution

1. Step 1: Write the proportion equation
   287,871.54 : 431,856.51 = 98,321.51 : x
2. Step 2: Convert to fraction form
   287,871.54/431,856.51 = 98,321.51/x
3. Step 3: Cross multiply
   287,871.54x = 431,856.51 × 98,321.51
4. Step 4: Simplify right side
   287,871.54x = 42,460,782,007.25
5. Step 5: Solve for x
   x = 42,460,782,007.25/287,871.54
6. Step 6: Final answer
   x = 147,499.06