Finding the Fourth Proportional to 1,005.88, 1,388.39 and 656.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.88 : 1,388.39 = 656.50 : x
2. Step 2: Convert to fraction form
   1,005.88/1,388.39 = 656.50/x
3. Step 3: Cross multiply
   1,005.88x = 1,388.39 × 656.50
4. Step 4: Simplify right side
   1,005.88x = 911,478.04
5. Step 5: Solve for x
   x = 911,478.04/1,005.88
6. Step 6: Final answer
   x = 906.15