Finding the Fourth Proportional to 5,123.61, 7,070.30 and 2,885.41

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.61 : 7,070.30 = 2,885.41 : x
2. Step 2: Convert to fraction form
   5,123.61/7,070.30 = 2,885.41/x
3. Step 3: Cross multiply
   5,123.61x = 7,070.30 × 2,885.41
4. Step 4: Simplify right side
   5,123.61x = 20,400,714.32
5. Step 5: Solve for x
   x = 20,400,714.32/5,123.61
6. Step 6: Final answer
   x = 3,981.71