Finding the Fourth Proportional to 465,898.88, 698,863.82 and 128,911.30

Step by Step Solution

1. Step 1: Write the proportion equation
   465,898.88 : 698,863.82 = 128,911.30 : x
2. Step 2: Convert to fraction form
   465,898.88/698,863.82 = 128,911.30/x
3. Step 3: Cross multiply
   465,898.88x = 698,863.82 × 128,911.30
4. Step 4: Simplify right side
   465,898.88x = 90,091,443,559.17
5. Step 5: Solve for x
   x = 90,091,443,559.17/465,898.88
6. Step 6: Final answer
   x = 193,371.24