Finding the Fourth Proportional to 1,561.31, 2,156.22 and 1,350.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.31 : 2,156.22 = 1,350.47 : x
2. Step 2: Convert to fraction form
   1,561.31/2,156.22 = 1,350.47/x
3. Step 3: Cross multiply
   1,561.31x = 2,156.22 × 1,350.47
4. Step 4: Simplify right side
   1,561.31x = 2,911,915.81
5. Step 5: Solve for x
   x = 2,911,915.81/1,561.31
6. Step 6: Final answer
   x = 1,865.05