Finding the Fourth Proportional to 9,457.78, 13,051.63 and 5,478.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,457.78 : 13,051.63 = 5,478.81 : x
2. Step 2: Convert to fraction form
   9,457.78/13,051.63 = 5,478.81/x
3. Step 3: Cross multiply
   9,457.78x = 13,051.63 × 5,478.81
4. Step 4: Simplify right side
   9,457.78x = 71,507,400.96
5. Step 5: Solve for x
   x = 71,507,400.96/9,457.78
6. Step 6: Final answer
   x = 7,560.70