Finding the Fourth Proportional to 1,915.07, 2,642.76 and 1,129.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.07 : 2,642.76 = 1,129.10 : x
2. Step 2: Convert to fraction form
   1,915.07/2,642.76 = 1,129.10/x
3. Step 3: Cross multiply
   1,915.07x = 2,642.76 × 1,129.10
4. Step 4: Simplify right side
   1,915.07x = 2,983,927.10
5. Step 5: Solve for x
   x = 2,983,927.10/1,915.07
6. Step 6: Final answer
   x = 1,558.13