Finding the Fourth Proportional to 55,870.55, 77,101.37 and 30,720.05

Step by Step Solution

1. Step 1: Write the proportion equation
   55,870.55 : 77,101.37 = 30,720.05 : x
2. Step 2: Convert to fraction form
   55,870.55/77,101.37 = 30,720.05/x
3. Step 3: Cross multiply
   55,870.55x = 77,101.37 × 30,720.05
4. Step 4: Simplify right side
   55,870.55x = 2,368,557,941.47
5. Step 5: Solve for x
   x = 2,368,557,941.47/55,870.55
6. Step 6: Final answer
   x = 42,393.68