Finding the Fourth Proportional to 2,526.86, 3,789.98 and 678.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,526.86 : 3,789.98 = 678.12 : x
2. Step 2: Convert to fraction form
   2,526.86/3,789.98 = 678.12/x
3. Step 3: Cross multiply
   2,526.86x = 3,789.98 × 678.12
4. Step 4: Simplify right side
   2,526.86x = 2,570,061.24
5. Step 5: Solve for x
   x = 2,570,061.24/2,526.86
6. Step 6: Final answer
   x = 1,017.10