Finding the Fourth Proportional to 1,613.42, 2,221.93 and 1,387.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.42 : 2,221.93 = 1,387.63 : x
2. Step 2: Convert to fraction form
   1,613.42/2,221.93 = 1,387.63/x
3. Step 3: Cross multiply
   1,613.42x = 2,221.93 × 1,387.63
4. Step 4: Simplify right side
   1,613.42x = 3,083,221.24
5. Step 5: Solve for x
   x = 3,083,221.24/1,613.42
6. Step 6: Final answer
   x = 1,910.99