Finding the Fourth Proportional to 1,117.86, 1,542.33 and 881.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117.86 : 1,542.33 = 881.07 : x
2. Step 2: Convert to fraction form
   1,117.86/1,542.33 = 881.07/x
3. Step 3: Cross multiply
   1,117.86x = 1,542.33 × 881.07
4. Step 4: Simplify right side
   1,117.86x = 1,358,900.69
5. Step 5: Solve for x
   x = 1,358,900.69/1,117.86
6. Step 6: Final answer
   x = 1,215.63