Finding the Fourth Proportional to 2,162.61, 2,985.39 and 1,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.61 : 2,985.39 = 1,377.72 : x
2. Step 2: Convert to fraction form
   2,162.61/2,985.39 = 1,377.72/x
3. Step 3: Cross multiply
   2,162.61x = 2,985.39 × 1,377.72
4. Step 4: Simplify right side
   2,162.61x = 4,113,031.51
5. Step 5: Solve for x
   x = 4,113,031.51/2,162.61
6. Step 6: Final answer
   x = 1,901.88