Finding the Fourth Proportional to 139,932.40, 209,948.72 and 59,936.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,932.40 : 209,948.72 = 59,936.80 : x
2. Step 2: Convert to fraction form
   139,932.40/209,948.72 = 59,936.80/x
3. Step 3: Cross multiply
   139,932.40x = 209,948.72 × 59,936.80
4. Step 4: Simplify right side
   139,932.40x = 12,583,654,440.90
5. Step 5: Solve for x
   x = 12,583,654,440.90/139,932.40
6. Step 6: Final answer
   x = 89,926.67