Finding the Fourth Proportional to 987.50, 1,362.89 and 821.43

Step by Step Solution

1. Step 1: Write the proportion equation
   987.50 : 1,362.89 = 821.43 : x
2. Step 2: Convert to fraction form
   987.50/1,362.89 = 821.43/x
3. Step 3: Cross multiply
   987.50x = 1,362.89 × 821.43
4. Step 4: Simplify right side
   987.50x = 1,119,514.63
5. Step 5: Solve for x
   x = 1,119,514.63/987.50
6. Step 6: Final answer
   x = 1,133.69