Finding the Fourth Proportional to 13,123.89, 19,678.55 and 4,354.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.89 : 19,678.55 = 4,354.02 : x
2. Step 2: Convert to fraction form
   13,123.89/19,678.55 = 4,354.02/x
3. Step 3: Cross multiply
   13,123.89x = 19,678.55 × 4,354.02
4. Step 4: Simplify right side
   13,123.89x = 85,680,778.50
5. Step 5: Solve for x
   x = 85,680,778.50/13,123.89
6. Step 6: Final answer
   x = 6,528.61