Finding the Fourth Proportional to 56,991, 78,647.61 and 31,840.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,991 : 78,647.61 = 31,840.50 : x
2. Step 2: Convert to fraction form
   56,991/78,647.61 = 31,840.50/x
3. Step 3: Cross multiply
   56,991x = 78,647.61 × 31,840.50
4. Step 4: Simplify right side
   56,991x = 2,504,179,226.21
5. Step 5: Solve for x
   x = 2,504,179,226.21/56,991
6. Step 6: Final answer
   x = 43,939.91