Finding the Fourth Proportional to 1,679.40, 2,317.86 and 981.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.40 : 2,317.86 = 981.16 : x
2. Step 2: Convert to fraction form
   1,679.40/2,317.86 = 981.16/x
3. Step 3: Cross multiply
   1,679.40x = 2,317.86 × 981.16
4. Step 4: Simplify right side
   1,679.40x = 2,274,191.52
5. Step 5: Solve for x
   x = 2,274,191.52/1,679.40
6. Step 6: Final answer
   x = 1,354.17