Finding the Fourth Proportional to 42,781.50, 64,144.98 and 17,838.90

Step by Step Solution

1. Step 1: Write the proportion equation
   42,781.50 : 64,144.98 = 17,838.90 : x
2. Step 2: Convert to fraction form
   42,781.50/64,144.98 = 17,838.90/x
3. Step 3: Cross multiply
   42,781.50x = 64,144.98 × 17,838.90
4. Step 4: Simplify right side
   42,781.50x = 1,144,275,883.72
5. Step 5: Solve for x
   x = 1,144,275,883.72/42,781.50
6. Step 6: Final answer
   x = 26,746.98