Finding the Fourth Proportional to 1,088.35, 1,501.53 and 646.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.35 : 1,501.53 = 646.09 : x
2. Step 2: Convert to fraction form
   1,088.35/1,501.53 = 646.09/x
3. Step 3: Cross multiply
   1,088.35x = 1,501.53 × 646.09
4. Step 4: Simplify right side
   1,088.35x = 970,123.52
5. Step 5: Solve for x
   x = 970,123.52/1,088.35
6. Step 6: Final answer
   x = 891.37