Finding the Fourth Proportional to 139,061.85, 191,897.20 and 78,645.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,061.85 : 191,897.20 = 78,645.16 : x
2. Step 2: Convert to fraction form
   139,061.85/191,897.20 = 78,645.16/x
3. Step 3: Cross multiply
   139,061.85x = 191,897.20 × 78,645.16
4. Step 4: Simplify right side
   139,061.85x = 15,091,785,997.55
5. Step 5: Solve for x
   x = 15,091,785,997.55/139,061.85
6. Step 6: Final answer
   x = 108,525.71