Finding the Fourth Proportional to 139,423.71, 209,017.89 and 60,478.41

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.71 : 209,017.89 = 60,478.41 : x
2. Step 2: Convert to fraction form
   139,423.71/209,017.89 = 60,478.41/x
3. Step 3: Cross multiply
   139,423.71x = 209,017.89 × 60,478.41
4. Step 4: Simplify right side
   139,423.71x = 12,641,069,648.75
5. Step 5: Solve for x
   x = 12,641,069,648.75/139,423.71
6. Step 6: Final answer
   x = 90,666.57