Finding the Fourth Proportional to 1,030.31, 1,420.76 and 715.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.31 : 1,420.76 = 715.93 : x
2. Step 2: Convert to fraction form
   1,030.31/1,420.76 = 715.93/x
3. Step 3: Cross multiply
   1,030.31x = 1,420.76 × 715.93
4. Step 4: Simplify right side
   1,030.31x = 1,017,164.71
5. Step 5: Solve for x
   x = 1,017,164.71/1,030.31
6. Step 6: Final answer
   x = 987.24