Finding the Fourth Proportional to 86,942.10, 130,499.55 and 42,618.90

Step by Step Solution

1. Step 1: Write the proportion equation
   86,942.10 : 130,499.55 = 42,618.90 : x
2. Step 2: Convert to fraction form
   86,942.10/130,499.55 = 42,618.90/x
3. Step 3: Cross multiply
   86,942.10x = 130,499.55 × 42,618.90
4. Step 4: Simplify right side
   86,942.10x = 5,561,747,271.50
5. Step 5: Solve for x
   x = 5,561,747,271.50/86,942.10
6. Step 6: Final answer
   x = 63,970.70