Finding the Fourth Proportional to 139,909.72, 193,053.36 and 78,643.84

Step by Step Solution

1. Step 1: Write the proportion equation
   139,909.72 : 193,053.36 = 78,643.84 : x
2. Step 2: Convert to fraction form
   139,909.72/193,053.36 = 78,643.84/x
3. Step 3: Cross multiply
   139,909.72x = 193,053.36 × 78,643.84
4. Step 4: Simplify right side
   139,909.72x = 15,182,457,555.30
5. Step 5: Solve for x
   x = 15,182,457,555.30/139,909.72
6. Step 6: Final answer
   x = 108,516.10