Finding the Fourth Proportional to 1,111.02, 1,663.92 and 561.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.02 : 1,663.92 = 561.48 : x
2. Step 2: Convert to fraction form
   1,111.02/1,663.92 = 561.48/x
3. Step 3: Cross multiply
   1,111.02x = 1,663.92 × 561.48
4. Step 4: Simplify right side
   1,111.02x = 934,257.80
5. Step 5: Solve for x
   x = 934,257.80/1,111.02
6. Step 6: Final answer
   x = 840.90