Finding the Fourth Proportional to 110,400, 152,390.40 and 65,687.04

Step by Step Solution

1. Step 1: Write the proportion equation
   110,400 : 152,390.40 = 65,687.04 : x
2. Step 2: Convert to fraction form
   110,400/152,390.40 = 65,687.04/x
3. Step 3: Cross multiply
   110,400x = 152,390.40 × 65,687.04
4. Step 4: Simplify right side
   110,400x = 10,010,074,300.42
5. Step 5: Solve for x
   x = 10,010,074,300.42/110,400
6. Step 6: Final answer
   x = 90,670.96