Finding the Fourth Proportional to 1,051.31, 1,577.15 and 503.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.31 : 1,577.15 = 503.39 : x
2. Step 2: Convert to fraction form
   1,051.31/1,577.15 = 503.39/x
3. Step 3: Cross multiply
   1,051.31x = 1,577.15 × 503.39
4. Step 4: Simplify right side
   1,051.31x = 793,921.54
5. Step 5: Solve for x
   x = 793,921.54/1,051.31
6. Step 6: Final answer
   x = 755.17