Finding the Fourth Proportional to 139,096.04, 191,962.06 and 78,666.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,096.04 : 191,962.06 = 78,666.70 : x
2. Step 2: Convert to fraction form
   139,096.04/191,962.06 = 78,666.70/x
3. Step 3: Cross multiply
   139,096.04x = 191,962.06 × 78,666.70
4. Step 4: Simplify right side
   139,096.04x = 15,101,021,785.40
5. Step 5: Solve for x
   x = 15,101,021,785.40/139,096.04
6. Step 6: Final answer
   x = 108,565.43