Finding the Fourth Proportional to 123,651.50, 170,645.67 and 78,312.83

Step by Step Solution

1. Step 1: Write the proportion equation
   123,651.50 : 170,645.67 = 78,312.83 : x
2. Step 2: Convert to fraction form
   123,651.50/170,645.67 = 78,312.83/x
3. Step 3: Cross multiply
   123,651.50x = 170,645.67 × 78,312.83
4. Step 4: Simplify right side
   123,651.50x = 13,363,744,491.72
5. Step 5: Solve for x
   x = 13,363,744,491.72/123,651.50
6. Step 6: Final answer
   x = 108,075.88