Finding the Fourth Proportional to 56,820.78, 78,412.88 and 31,326.59

Step by Step Solution

1. Step 1: Write the proportion equation
   56,820.78 : 78,412.88 = 31,326.59 : x
2. Step 2: Convert to fraction form
   56,820.78/78,412.88 = 31,326.59/x
3. Step 3: Cross multiply
   56,820.78x = 78,412.88 × 31,326.59
4. Step 4: Simplify right side
   56,820.78x = 2,456,408,020.08
5. Step 5: Solve for x
   x = 2,456,408,020.08/56,820.78
6. Step 6: Final answer
   x = 43,230.80