Finding the Fourth Proportional to 1,510.21, 2,084.01 and 1,012.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.21 : 2,084.01 = 1,012.78 : x
2. Step 2: Convert to fraction form
   1,510.21/2,084.01 = 1,012.78/x
3. Step 3: Cross multiply
   1,510.21x = 2,084.01 × 1,012.78
4. Step 4: Simplify right side
   1,510.21x = 2,110,643.65
5. Step 5: Solve for x
   x = 2,110,643.65/1,510.21
6. Step 6: Final answer
   x = 1,397.58