Finding the Fourth Proportional to 1,065.69, 1,470.55 and 623.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.69 : 1,470.55 = 623.51 : x
2. Step 2: Convert to fraction form
   1,065.69/1,470.55 = 623.51/x
3. Step 3: Cross multiply
   1,065.69x = 1,470.55 × 623.51
4. Step 4: Simplify right side
   1,065.69x = 916,893.72
5. Step 5: Solve for x
   x = 916,893.72/1,065.69
6. Step 6: Final answer
   x = 860.38