Finding the Fourth Proportional to 42,390, 58,498.20 and 25,623

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 58,498.20 = 25,623 : x
2. Step 2: Convert to fraction form
   42,390/58,498.20 = 25,623/x
3. Step 3: Cross multiply
   42,390x = 58,498.20 × 25,623
4. Step 4: Simplify right side
   42,390x = 1,498,899,378.60
5. Step 5: Solve for x
   x = 1,498,899,378.60/42,390
6. Step 6: Final answer
   x = 35,359.74