Finding the Fourth Proportional to 139,258.20, 208,916.25 and 63,320.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,258.20 : 208,916.25 = 63,320.55 : x
2. Step 2: Convert to fraction form
   139,258.20/208,916.25 = 63,320.55/x
3. Step 3: Cross multiply
   139,258.20x = 208,916.25 × 63,320.55
4. Step 4: Simplify right side
   139,258.20x = 13,228,691,853.94
5. Step 5: Solve for x
   x = 13,228,691,853.94/139,258.20
6. Step 6: Final answer
   x = 94,993.99