Finding the Fourth Proportional to 56,137.50, 77,469.89 and 30,987

Step by Step Solution

1. Step 1: Write the proportion equation
   56,137.50 : 77,469.89 = 30,987 : x
2. Step 2: Convert to fraction form
   56,137.50/77,469.89 = 30,987/x
3. Step 3: Cross multiply
   56,137.50x = 77,469.89 × 30,987
4. Step 4: Simplify right side
   56,137.50x = 2,400,559,326.50
5. Step 5: Solve for x
   x = 2,400,559,326.50/56,137.50
6. Step 6: Final answer
   x = 42,762.13