Finding the Fourth Proportional to 81,978.71, 113,127.64 and 45,678.28

Step by Step Solution

1. Step 1: Write the proportion equation
   81,978.71 : 113,127.64 = 45,678.28 : x
2. Step 2: Convert to fraction form
   81,978.71/113,127.64 = 45,678.28/x
3. Step 3: Cross multiply
   81,978.71x = 113,127.64 × 45,678.28
4. Step 4: Simplify right side
   81,978.71x = 5,167,476,070.09
5. Step 5: Solve for x
   x = 5,167,476,070.09/81,978.71
6. Step 6: Final answer
   x = 63,034.36