Finding the Fourth Proportional to 139,053.71, 191,882.31 and 78,615.97

Step by Step Solution

1. Step 1: Write the proportion equation
   139,053.71 : 191,882.31 = 78,615.97 : x
2. Step 2: Convert to fraction form
   139,053.71/191,882.31 = 78,615.97/x
3. Step 3: Cross multiply
   139,053.71x = 191,882.31 × 78,615.97
4. Step 4: Simplify right side
   139,053.71x = 15,085,013,926.49
5. Step 5: Solve for x
   x = 15,085,013,926.49/139,053.71
6. Step 6: Final answer
   x = 108,483.36