Finding the Fourth Proportional to 12,980.22, 19,471.05 and 3,620.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.22 : 19,471.05 = 3,620.25 : x
2. Step 2: Convert to fraction form
   12,980.22/19,471.05 = 3,620.25/x
3. Step 3: Cross multiply
   12,980.22x = 19,471.05 × 3,620.25
4. Step 4: Simplify right side
   12,980.22x = 70,490,068.76
5. Step 5: Solve for x
   x = 70,490,068.76/12,980.22
6. Step 6: Final answer
   x = 5,430.58