Finding the Fourth Proportional to 139,289.31, 208,960.56 and 59,325.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,289.31 : 208,960.56 = 59,325.57 : x
2. Step 2: Convert to fraction form
   139,289.31/208,960.56 = 59,325.57/x
3. Step 3: Cross multiply
   139,289.31x = 208,960.56 × 59,325.57
4. Step 4: Simplify right side
   139,289.31x = 12,396,704,329.52
5. Step 5: Solve for x
   x = 12,396,704,329.52/139,289.31
6. Step 6: Final answer
   x = 88,999.68