Finding the Fourth Proportional to 42,880.75, 64,309.50 and 17,915.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,880.75 : 64,309.50 = 17,915.58 : x
2. Step 2: Convert to fraction form
   42,880.75/64,309.50 = 17,915.58/x
3. Step 3: Cross multiply
   42,880.75x = 64,309.50 × 17,915.58
4. Step 4: Simplify right side
   42,880.75x = 1,152,141,992.01
5. Step 5: Solve for x
   x = 1,152,141,992.01/42,880.75
6. Step 6: Final answer
   x = 26,868.51