Finding the Fourth Proportional to 12,920.18, 19,380.67 and 4,600.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.18 : 19,380.67 = 4,600.06 : x
2. Step 2: Convert to fraction form
   12,920.18/19,380.67 = 4,600.06/x
3. Step 3: Cross multiply
   12,920.18x = 19,380.67 × 4,600.06
4. Step 4: Simplify right side
   12,920.18x = 89,152,184.89
5. Step 5: Solve for x
   x = 89,152,184.89/12,920.18
6. Step 6: Final answer
   x = 6,900.23