Finding the Fourth Proportional to 92,725.50, 139,111.56 and 42,840.90

Step by Step Solution

1. Step 1: Write the proportion equation
   92,725.50 : 139,111.56 = 42,840.90 : x
2. Step 2: Convert to fraction form
   92,725.50/139,111.56 = 42,840.90/x
3. Step 3: Cross multiply
   92,725.50x = 139,111.56 × 42,840.90
4. Step 4: Simplify right side
   92,725.50x = 5,959,664,430.80
5. Step 5: Solve for x
   x = 5,959,664,430.80/92,725.50
6. Step 6: Final answer
   x = 64,272.12