Finding the Fourth Proportional to 42,874.35, 64,311.55 and 17,900.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,874.35 : 64,311.55 = 17,900.78 : x
2. Step 2: Convert to fraction form
   42,874.35/64,311.55 = 17,900.78/x
3. Step 3: Cross multiply
   42,874.35x = 64,311.55 × 17,900.78
4. Step 4: Simplify right side
   42,874.35x = 1,151,227,004.14
5. Step 5: Solve for x
   x = 1,151,227,004.14/42,874.35
6. Step 6: Final answer
   x = 26,851.19