Finding the Fourth Proportional to 56,570.55, 78,067.49 and 31,420.05

Step by Step Solution

1. Step 1: Write the proportion equation
   56,570.55 : 78,067.49 = 31,420.05 : x
2. Step 2: Convert to fraction form
   56,570.55/78,067.49 = 31,420.05/x
3. Step 3: Cross multiply
   56,570.55x = 78,067.49 × 31,420.05
4. Step 4: Simplify right side
   56,570.55x = 2,452,884,282.07
5. Step 5: Solve for x
   x = 2,452,884,282.07/56,570.55
6. Step 6: Final answer
   x = 43,359.74