Finding the Fourth Proportional to 124,410.80, 186,528.72 and 57,780.20

Step by Step Solution

1. Step 1: Write the proportion equation
   124,410.80 : 186,528.72 = 57,780.20 : x
2. Step 2: Convert to fraction form
   124,410.80/186,528.72 = 57,780.20/x
3. Step 3: Cross multiply
   124,410.80x = 186,528.72 × 57,780.20
4. Step 4: Simplify right side
   124,410.80x = 10,777,666,747.34
5. Step 5: Solve for x
   x = 10,777,666,747.34/124,410.80
6. Step 6: Final answer
   x = 86,629.67