Finding the Fourth Proportional to 9,005.78, 12,428.67 and 4,973.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,005.78 : 12,428.67 = 4,973.39 : x
2. Step 2: Convert to fraction form
   9,005.78/12,428.67 = 4,973.39/x
3. Step 3: Cross multiply
   9,005.78x = 12,428.67 × 4,973.39
4. Step 4: Simplify right side
   9,005.78x = 61,812,560.95
5. Step 5: Solve for x
   x = 61,812,560.95/9,005.78
6. Step 6: Final answer
   x = 6,863.66