Finding the Fourth Proportional to 465,139.78, 697,585.12 and 128,100.32

Step by Step Solution

1. Step 1: Write the proportion equation
   465,139.78 : 697,585.12 = 128,100.32 : x
2. Step 2: Convert to fraction form
   465,139.78/697,585.12 = 128,100.32/x
3. Step 3: Cross multiply
   465,139.78x = 697,585.12 × 128,100.32
4. Step 4: Simplify right side
   465,139.78x = 89,360,877,099.24
5. Step 5: Solve for x
   x = 89,360,877,099.24/465,139.78
6. Step 6: Final answer
   x = 192,116.18