Finding the Fourth Proportional to 123,693.80, 170,715.77 and 78,376.01

Step by Step Solution

1. Step 1: Write the proportion equation
   123,693.80 : 170,715.77 = 78,376.01 : x
2. Step 2: Convert to fraction form
   123,693.80/170,715.77 = 78,376.01/x
3. Step 3: Cross multiply
   123,693.80x = 170,715.77 × 78,376.01
4. Step 4: Simplify right side
   123,693.80x = 13,380,019,651.22
5. Step 5: Solve for x
   x = 13,380,019,651.22/123,693.80
6. Step 6: Final answer
   x = 108,170.50