Finding the Fourth Proportional to 1,402.16, 1,929.48 and 1,307.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.16 : 1,929.48 = 1,307.12 : x
2. Step 2: Convert to fraction form
   1,402.16/1,929.48 = 1,307.12/x
3. Step 3: Cross multiply
   1,402.16x = 1,929.48 × 1,307.12
4. Step 4: Simplify right side
   1,402.16x = 2,522,061.90
5. Step 5: Solve for x
   x = 2,522,061.90/1,402.16
6. Step 6: Final answer
   x = 1,798.70