Finding the Fourth Proportional to 91,477.78, 137,142.71 and 38,210.57

Step by Step Solution

1. Step 1: Write the proportion equation
   91,477.78 : 137,142.71 = 38,210.57 : x
2. Step 2: Convert to fraction form
   91,477.78/137,142.71 = 38,210.57/x
3. Step 3: Cross multiply
   91,477.78x = 137,142.71 × 38,210.57
4. Step 4: Simplify right side
   91,477.78x = 5,240,300,434.73
5. Step 5: Solve for x
   x = 5,240,300,434.73/91,477.78
6. Step 6: Final answer
   x = 57,284.95