Finding the Fourth Proportional to 1,291.47, 1,938.00 and 561.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.47 : 1,938.00 = 561.10 : x
2. Step 2: Convert to fraction form
   1,291.47/1,938.00 = 561.10/x
3. Step 3: Cross multiply
   1,291.47x = 1,938.00 × 561.10
4. Step 4: Simplify right side
   1,291.47x = 1,087,416.57
5. Step 5: Solve for x
   x = 1,087,416.57/1,291.47
6. Step 6: Final answer
   x = 842.00