Finding the Fourth Proportional to 1,561.76, 2,343.20 and 946.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.76 : 2,343.20 = 946.72 : x
2. Step 2: Convert to fraction form
   1,561.76/2,343.20 = 946.72/x
3. Step 3: Cross multiply
   1,561.76x = 2,343.20 × 946.72
4. Step 4: Simplify right side
   1,561.76x = 2,218,354.30
5. Step 5: Solve for x
   x = 2,218,354.30/1,561.76
6. Step 6: Final answer
   x = 1,420.42