Finding the Fourth Proportional to 1,012.88, 1,397.72 and 593.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.88 : 1,397.72 = 593.30 : x
2. Step 2: Convert to fraction form
   1,012.88/1,397.72 = 593.30/x
3. Step 3: Cross multiply
   1,012.88x = 1,397.72 × 593.30
4. Step 4: Simplify right side
   1,012.88x = 829,267.28
5. Step 5: Solve for x
   x = 829,267.28/1,012.88
6. Step 6: Final answer
   x = 818.72