Finding the Fourth Proportional to 139,406.64, 208,992.42 and 60,461.43

Step by Step Solution

1. Step 1: Write the proportion equation
   139,406.64 : 208,992.42 = 60,461.43 : x
2. Step 2: Convert to fraction form
   139,406.64/208,992.42 = 60,461.43/x
3. Step 3: Cross multiply
   139,406.64x = 208,992.42 × 60,461.43
4. Step 4: Simplify right side
   139,406.64x = 12,635,980,572.36
5. Step 5: Solve for x
   x = 12,635,980,572.36/139,406.64
6. Step 6: Final answer
   x = 90,641.17