Finding the Fourth Proportional to 61,870.82, 85,337.60 and 56,782.73

Step by Step Solution

1. Step 1: Write the proportion equation
   61,870.82 : 85,337.60 = 56,782.73 : x
2. Step 2: Convert to fraction form
   61,870.82/85,337.60 = 56,782.73/x
3. Step 3: Cross multiply
   61,870.82x = 85,337.60 × 56,782.73
4. Step 4: Simplify right side
   61,870.82x = 4,845,701,189.05
5. Step 5: Solve for x
   x = 4,845,701,189.05/61,870.82
6. Step 6: Final answer
   x = 78,319.66