Finding the Fourth Proportional to 139,047.33, 191,895.15 and 78,618.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,047.33 : 191,895.15 = 78,618.57 : x
2. Step 2: Convert to fraction form
   139,047.33/191,895.15 = 78,618.57/x
3. Step 3: Cross multiply
   139,047.33x = 191,895.15 × 78,618.57
4. Step 4: Simplify right side
   139,047.33x = 15,086,522,282.94
5. Step 5: Solve for x
   x = 15,086,522,282.94/139,047.33
6. Step 6: Final answer
   x = 108,499.19