Finding the Fourth Proportional to 56,138, 77,471.52 and 30,986.96

Step by Step Solution

1. Step 1: Write the proportion equation
   56,138 : 77,471.52 = 30,986.96 : x
2. Step 2: Convert to fraction form
   56,138/77,471.52 = 30,986.96/x
3. Step 3: Cross multiply
   56,138x = 77,471.52 × 30,986.96
4. Step 4: Simplify right side
   56,138x = 2,400,606,891.38
5. Step 5: Solve for x
   x = 2,400,606,891.38/56,138
6. Step 6: Final answer
   x = 42,762.60