Finding the Fourth Proportional to 1,510.91, 2,083.13 and 978.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.91 : 2,083.13 = 978.86 : x
2. Step 2: Convert to fraction form
   1,510.91/2,083.13 = 978.86/x
3. Step 3: Cross multiply
   1,510.91x = 2,083.13 × 978.86
4. Step 4: Simplify right side
   1,510.91x = 2,039,087.74
5. Step 5: Solve for x
   x = 2,039,087.74/1,510.91
6. Step 6: Final answer
   x = 1,349.58