Finding the Fourth Proportional to 139,059.07, 191,900.35 and 78,641.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,059.07 : 191,900.35 = 78,641.57 : x
2. Step 2: Convert to fraction form
   139,059.07/191,900.35 = 78,641.57/x
3. Step 3: Cross multiply
   139,059.07x = 191,900.35 × 78,641.57
4. Step 4: Simplify right side
   139,059.07x = 15,091,344,807.55
5. Step 5: Solve for x
   x = 15,091,344,807.55/139,059.07
6. Step 6: Final answer
   x = 108,524.71