Finding the Fourth Proportional to 1,065.74, 1,470.71 and 623.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.74 : 1,470.71 = 623.55 : x
2. Step 2: Convert to fraction form
   1,065.74/1,470.71 = 623.55/x
3. Step 3: Cross multiply
   1,065.74x = 1,470.71 × 623.55
4. Step 4: Simplify right side
   1,065.74x = 917,066.46
5. Step 5: Solve for x
   x = 917,066.46/1,065.74
6. Step 6: Final answer
   x = 860.50