Finding the Fourth Proportional to 3,415.50, 5,123.34 and 1,561.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,415.50 : 5,123.34 = 1,561.05 : x
2. Step 2: Convert to fraction form
   3,415.50/5,123.34 = 1,561.05/x
3. Step 3: Cross multiply
   3,415.50x = 5,123.34 × 1,561.05
4. Step 4: Simplify right side
   3,415.50x = 7,997,789.91
5. Step 5: Solve for x
   x = 7,997,789.91/3,415.50
6. Step 6: Final answer
   x = 2,341.62