Finding the Fourth Proportional to 139,002.75, 208,505.95 and 45,508.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,002.75 : 208,505.95 = 45,508.50 : x
2. Step 2: Convert to fraction form
   139,002.75/208,505.95 = 45,508.50/x
3. Step 3: Cross multiply
   139,002.75x = 208,505.95 × 45,508.50
4. Step 4: Simplify right side
   139,002.75x = 9,488,792,911.80
5. Step 5: Solve for x
   x = 9,488,792,911.80/139,002.75
6. Step 6: Final answer
   x = 68,263.35