Finding the Fourth Proportional to 49,431, 74,174.88 and 49,029.78

Step by Step Solution

1. Step 1: Write the proportion equation
   49,431 : 74,174.88 = 49,029.78 : x
2. Step 2: Convert to fraction form
   49,431/74,174.88 = 49,029.78/x
3. Step 3: Cross multiply
   49,431x = 74,174.88 × 49,029.78
4. Step 4: Simplify right side
   49,431x = 3,636,778,047.93
5. Step 5: Solve for x
   x = 3,636,778,047.93/49,431
6. Step 6: Final answer
   x = 73,572.82