Finding the Fourth Proportional to 140,641.55, 194,085.02 and 76,978.79

Step by Step Solution

1. Step 1: Write the proportion equation
   140,641.55 : 194,085.02 = 76,978.79 : x
2. Step 2: Convert to fraction form
   140,641.55/194,085.02 = 76,978.79/x
3. Step 3: Cross multiply
   140,641.55x = 194,085.02 × 76,978.79
4. Step 4: Simplify right side
   140,641.55x = 14,940,429,611.83
5. Step 5: Solve for x
   x = 14,940,429,611.83/140,641.55
6. Step 6: Final answer
   x = 106,230.55