Finding the Fourth Proportional to 139,080.30, 208,657.89 and 71,575.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,080.30 : 208,657.89 = 71,575.55 : x
2. Step 2: Convert to fraction form
   139,080.30/208,657.89 = 71,575.55/x
3. Step 3: Cross multiply
   139,080.30x = 208,657.89 × 71,575.55
4. Step 4: Simplify right side
   139,080.30x = 14,934,802,195.30
5. Step 5: Solve for x
   x = 14,934,802,195.30/139,080.30
6. Step 6: Final answer
   x = 107,382.59