Finding the Fourth Proportional to 139,815.19, 209,753.92 and 51,068.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,815.19 : 209,753.92 = 51,068.55 : x
2. Step 2: Convert to fraction form
   139,815.19/209,753.92 = 51,068.55/x
3. Step 3: Cross multiply
   139,815.19x = 209,753.92 × 51,068.55
4. Step 4: Simplify right side
   139,815.19x = 10,711,828,551.22
5. Step 5: Solve for x
   x = 10,711,828,551.22/139,815.19
6. Step 6: Final answer
   x = 76,614.20