Finding the Fourth Proportional to 56,811, 78,317.20 and 39,762.48

Step by Step Solution

1. Step 1: Write the proportion equation
   56,811 : 78,317.20 = 39,762.48 : x
2. Step 2: Convert to fraction form
   56,811/78,317.20 = 39,762.48/x
3. Step 3: Cross multiply
   56,811x = 78,317.20 × 39,762.48
4. Step 4: Simplify right side
   56,811x = 3,114,086,098.66
5. Step 5: Solve for x
   x = 3,114,086,098.66/56,811
6. Step 6: Final answer
   x = 54,814.84