Finding the Fourth Proportional to 85,424.90, 128,153.42 and 42,753.12

Step by Step Solution

1. Step 1: Write the proportion equation
   85,424.90 : 128,153.42 = 42,753.12 : x
2. Step 2: Convert to fraction form
   85,424.90/128,153.42 = 42,753.12/x
3. Step 3: Cross multiply
   85,424.90x = 128,153.42 × 42,753.12
4. Step 4: Simplify right side
   85,424.90x = 5,478,957,889.41
5. Step 5: Solve for x
   x = 5,478,957,889.41/85,424.90
6. Step 6: Final answer
   x = 64,137.71