Finding the Fourth Proportional to 85,981.48, 128,683.98 and 63,061.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,981.48 : 128,683.98 = 63,061.72 : x
2. Step 2: Convert to fraction form
   85,981.48/128,683.98 = 63,061.72/x
3. Step 3: Cross multiply
   85,981.48x = 128,683.98 × 63,061.72
4. Step 4: Simplify right side
   85,981.48x = 8,115,033,115.25
5. Step 5: Solve for x
   x = 8,115,033,115.25/85,981.48
6. Step 6: Final answer
   x = 94,381.18