Finding the Fourth Proportional to 111,340, 166,591.50 and 78,124.87

Step by Step Solution

1. Step 1: Write the proportion equation
   111,340 : 166,591.50 = 78,124.87 : x
2. Step 2: Convert to fraction form
   111,340/166,591.50 = 78,124.87/x
3. Step 3: Cross multiply
   111,340x = 166,591.50 × 78,124.87
4. Step 4: Simplify right side
   111,340x = 13,014,939,280.61
5. Step 5: Solve for x
   x = 13,014,939,280.61/111,340
6. Step 6: Final answer
   x = 116,893.65