Finding the Fourth Proportional to 42,900.55, 64,328.88 and 17,933.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,900.55 : 64,328.88 = 17,933.78 : x
2. Step 2: Convert to fraction form
   42,900.55/64,328.88 = 17,933.78/x
3. Step 3: Cross multiply
   42,900.55x = 64,328.88 × 17,933.78
4. Step 4: Simplify right side
   42,900.55x = 1,153,659,981.57
5. Step 5: Solve for x
   x = 1,153,659,981.57/42,900.55
6. Step 6: Final answer
   x = 26,891.50