Finding the Fourth Proportional to 42,880.25, 64,308.75 and 17,915.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,880.25 : 64,308.75 = 17,915.08 : x
2. Step 2: Convert to fraction form
   42,880.25/64,308.75 = 17,915.08/x
3. Step 3: Cross multiply
   42,880.25x = 64,308.75 × 17,915.08
4. Step 4: Simplify right side
   42,880.25x = 1,152,096,079.41
5. Step 5: Solve for x
   x = 1,152,096,079.41/42,880.25
6. Step 6: Final answer
   x = 26,867.76