Finding the Fourth Proportional to 72,031.80, 108,111.70 and 42,412.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,031.80 : 108,111.70 = 42,412.60 : x
2. Step 2: Convert to fraction form
   72,031.80/108,111.70 = 42,412.60/x
3. Step 3: Cross multiply
   72,031.80x = 108,111.70 × 42,412.60
4. Step 4: Simplify right side
   72,031.80x = 4,585,298,287.42
5. Step 5: Solve for x
   x = 4,585,298,287.42/72,031.80
6. Step 6: Final answer
   x = 63,656.58