Finding the Fourth Proportional to 123,215.40, 170,037.72 and 77,913.18

Step by Step Solution

1. Step 1: Write the proportion equation
   123,215.40 : 170,037.72 = 77,913.18 : x
2. Step 2: Convert to fraction form
   123,215.40/170,037.72 = 77,913.18/x
3. Step 3: Cross multiply
   123,215.40x = 170,037.72 × 77,913.18
4. Step 4: Simplify right side
   123,215.40x = 13,248,179,485.15
5. Step 5: Solve for x
   x = 13,248,179,485.15/123,215.40
6. Step 6: Final answer
   x = 107,520.48