Finding the Fourth Proportional to 105,068.80, 157,430.40 and 87,443.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,068.80 : 157,430.40 = 87,443.20 : x
2. Step 2: Convert to fraction form
   105,068.80/157,430.40 = 87,443.20/x
3. Step 3: Cross multiply
   105,068.80x = 157,430.40 × 87,443.20
4. Step 4: Simplify right side
   105,068.80x = 13,766,217,953.28
5. Step 5: Solve for x
   x = 13,766,217,953.28/105,068.80
6. Step 6: Final answer
   x = 131,020.99