Finding the Fourth Proportional to 1,870.47, 2,802.53 and 1,321.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.47 : 2,802.53 = 1,321.61 : x
2. Step 2: Convert to fraction form
   1,870.47/2,802.53 = 1,321.61/x
3. Step 3: Cross multiply
   1,870.47x = 2,802.53 × 1,321.61
4. Step 4: Simplify right side
   1,870.47x = 3,703,831.05
5. Step 5: Solve for x
   x = 3,703,831.05/1,870.47
6. Step 6: Final answer
   x = 1,980.16