Finding the Fourth Proportional to 105,315.59, 145,325.24 and 59,990.02

Step by Step Solution

1. Step 1: Write the proportion equation
   105,315.59 : 145,325.24 = 59,990.02 : x
2. Step 2: Convert to fraction form
   105,315.59/145,325.24 = 59,990.02/x
3. Step 3: Cross multiply
   105,315.59x = 145,325.24 × 59,990.02
4. Step 4: Simplify right side
   105,315.59x = 8,718,063,615.80
5. Step 5: Solve for x
   x = 8,718,063,615.80/105,315.59
6. Step 6: Final answer
   x = 82,780.37