Finding the Fourth Proportional to 9,354.51, 12,910.86 and 5,577.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.51 : 12,910.86 = 5,577.90 : x
2. Step 2: Convert to fraction form
   9,354.51/12,910.86 = 5,577.90/x
3. Step 3: Cross multiply
   9,354.51x = 12,910.86 × 5,577.90
4. Step 4: Simplify right side
   9,354.51x = 72,015,485.99
5. Step 5: Solve for x
   x = 72,015,485.99/9,354.51
6. Step 6: Final answer
   x = 7,698.48