Finding the Fourth Proportional to 9,101.89, 12,561.81 and 5,123.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,101.89 : 12,561.81 = 5,123.77 : x
2. Step 2: Convert to fraction form
   9,101.89/12,561.81 = 5,123.77/x
3. Step 3: Cross multiply
   9,101.89x = 12,561.81 × 5,123.77
4. Step 4: Simplify right side
   9,101.89x = 64,363,856.63
5. Step 5: Solve for x
   x = 64,363,856.63/9,101.89
6. Step 6: Final answer
   x = 7,071.49