Finding the Fourth Proportional to 1,656.56, 2,485.12 and 561.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,656.56 : 2,485.12 = 561.72 : x
2. Step 2: Convert to fraction form
   1,656.56/2,485.12 = 561.72/x
3. Step 3: Cross multiply
   1,656.56x = 2,485.12 × 561.72
4. Step 4: Simplify right side
   1,656.56x = 1,395,941.61
5. Step 5: Solve for x
   x = 1,395,941.61/1,656.56
6. Step 6: Final answer
   x = 842.67