Finding the Fourth Proportional to 8,978.04, 12,389.90 and 4,999.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.04 : 12,389.90 = 4,999.52 : x
2. Step 2: Convert to fraction form
   8,978.04/12,389.90 = 4,999.52/x
3. Step 3: Cross multiply
   8,978.04x = 12,389.90 × 4,999.52
4. Step 4: Simplify right side
   8,978.04x = 61,943,558.83
5. Step 5: Solve for x
   x = 61,943,558.83/8,978.04
6. Step 6: Final answer
   x = 6,899.45