Finding the Fourth Proportional to 9,780.32, 14,666.16 and 3,620

Step by Step Solution

1. Step 1: Write the proportion equation
   9,780.32 : 14,666.16 = 3,620 : x
2. Step 2: Convert to fraction form
   9,780.32/14,666.16 = 3,620/x
3. Step 3: Cross multiply
   9,780.32x = 14,666.16 × 3,620
4. Step 4: Simplify right side
   9,780.32x = 53,091,499.20
5. Step 5: Solve for x
   x = 53,091,499.20/9,780.32
6. Step 6: Final answer
   x = 5,428.40