Finding the Fourth Proportional to 42,987.96, 64,480.32 and 17,686.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,987.96 : 64,480.32 = 17,686.53 : x
2. Step 2: Convert to fraction form
   42,987.96/64,480.32 = 17,686.53/x
3. Step 3: Cross multiply
   42,987.96x = 64,480.32 × 17,686.53
4. Step 4: Simplify right side
   42,987.96x = 1,140,433,114.09
5. Step 5: Solve for x
   x = 1,140,433,114.09/42,987.96
6. Step 6: Final answer
   x = 26,529.13