Finding the Fourth Proportional to 1,065.56, 1,470.56 and 623.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.56 : 1,470.56 = 623.50 : x
2. Step 2: Convert to fraction form
   1,065.56/1,470.56 = 623.50/x
3. Step 3: Cross multiply
   1,065.56x = 1,470.56 × 623.50
4. Step 4: Simplify right side
   1,065.56x = 916,887.37
5. Step 5: Solve for x
   x = 916,887.37/1,065.56
6. Step 6: Final answer
   x = 860.48