Finding the Fourth Proportional to 1,613.58, 2,420.31 and 887.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.58 : 2,420.31 = 887.72 : x
2. Step 2: Convert to fraction form
   1,613.58/2,420.31 = 887.72/x
3. Step 3: Cross multiply
   1,613.58x = 2,420.31 × 887.72
4. Step 4: Simplify right side
   1,613.58x = 2,148,548.82
5. Step 5: Solve for x
   x = 2,148,548.82/1,613.58
6. Step 6: Final answer
   x = 1,331.54