Finding the Fourth Proportional to 1,008.61, 1,510.78 and 461.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.61 : 1,510.78 = 461.25 : x
2. Step 2: Convert to fraction form
   1,008.61/1,510.78 = 461.25/x
3. Step 3: Cross multiply
   1,008.61x = 1,510.78 × 461.25
4. Step 4: Simplify right side
   1,008.61x = 696,846.83
5. Step 5: Solve for x
   x = 696,846.83/1,008.61
6. Step 6: Final answer
   x = 690.90