Finding the Fourth Proportional to 11,887.56, 17,829.95 and 3,123.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,887.56 : 17,829.95 = 3,123.15 : x
2. Step 2: Convert to fraction form
   11,887.56/17,829.95 = 3,123.15/x
3. Step 3: Cross multiply
   11,887.56x = 17,829.95 × 3,123.15
4. Step 4: Simplify right side
   11,887.56x = 55,685,592.73
5. Step 5: Solve for x
   x = 55,685,592.73/11,887.56
6. Step 6: Final answer
   x = 4,684.36