Finding the Fourth Proportional to 72,380.70, 108,534.60 and 42,807.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,380.70 : 108,534.60 = 42,807.60 : x
2. Step 2: Convert to fraction form
   72,380.70/108,534.60 = 42,807.60/x
3. Step 3: Cross multiply
   72,380.70x = 108,534.60 × 42,807.60
4. Step 4: Simplify right side
   72,380.70x = 4,646,105,742.96
5. Step 5: Solve for x
   x = 4,646,105,742.96/72,380.70
6. Step 6: Final answer
   x = 64,189.84