Finding the Fourth Proportional to 103,012.02, 142,161.84 and 57,687.35

Step by Step Solution

1. Step 1: Write the proportion equation
   103,012.02 : 142,161.84 = 57,687.35 : x
2. Step 2: Convert to fraction form
   103,012.02/142,161.84 = 57,687.35/x
3. Step 3: Cross multiply
   103,012.02x = 142,161.84 × 57,687.35
4. Step 4: Simplify right side
   103,012.02x = 8,200,939,109.91
5. Step 5: Solve for x
   x = 8,200,939,109.91/103,012.02
6. Step 6: Final answer
   x = 79,611.48