Finding the Fourth Proportional to 65,499.60, 90,389.48 and 38,642.16

Step by Step Solution

1. Step 1: Write the proportion equation
   65,499.60 : 90,389.48 = 38,642.16 : x
2. Step 2: Convert to fraction form
   65,499.60/90,389.48 = 38,642.16/x
3. Step 3: Cross multiply
   65,499.60x = 90,389.48 × 38,642.16
4. Step 4: Simplify right side
   65,499.60x = 3,492,844,555.27
5. Step 5: Solve for x
   x = 3,492,844,555.27/65,499.60
6. Step 6: Final answer
   x = 53,326.20