Finding the Fourth Proportional to 1,071.67, 1,478.82 and 623.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.67 : 1,478.82 = 623.47 : x
2. Step 2: Convert to fraction form
   1,071.67/1,478.82 = 623.47/x
3. Step 3: Cross multiply
   1,071.67x = 1,478.82 × 623.47
4. Step 4: Simplify right side
   1,071.67x = 921,999.91
5. Step 5: Solve for x
   x = 921,999.91/1,071.67
6. Step 6: Final answer
   x = 860.34