Finding the Fourth Proportional to 42,359.80, 58,532.70 and 30,402.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,359.80 : 58,532.70 = 30,402.40 : x
2. Step 2: Convert to fraction form
   42,359.80/58,532.70 = 30,402.40/x
3. Step 3: Cross multiply
   42,359.80x = 58,532.70 × 30,402.40
4. Step 4: Simplify right side
   42,359.80x = 1,779,534,558.48
5. Step 5: Solve for x
   x = 1,779,534,558.48/42,359.80
6. Step 6: Final answer
   x = 42,009.98