Finding the Fourth Proportional to 1,071.93, 1,479.30 and 629.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.93 : 1,479.30 = 629.86 : x
2. Step 2: Convert to fraction form
   1,071.93/1,479.30 = 629.86/x
3. Step 3: Cross multiply
   1,071.93x = 1,479.30 × 629.86
4. Step 4: Simplify right side
   1,071.93x = 931,748.61
5. Step 5: Solve for x
   x = 931,748.61/1,071.93
6. Step 6: Final answer
   x = 869.22