Finding the Fourth Proportional to 42,870.25, 64,315.10 and 15,168.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.25 : 64,315.10 = 15,168.25 : x
2. Step 2: Convert to fraction form
   42,870.25/64,315.10 = 15,168.25/x
3. Step 3: Cross multiply
   42,870.25x = 64,315.10 × 15,168.25
4. Step 4: Simplify right side
   42,870.25x = 975,547,515.58
5. Step 5: Solve for x
   x = 975,547,515.58/42,870.25
6. Step 6: Final answer
   x = 22,755.82