Finding the Fourth Proportional to 81,870.69, 112,940.21 and 47,856.95

Step by Step Solution

1. Step 1: Write the proportion equation
   81,870.69 : 112,940.21 = 47,856.95 : x
2. Step 2: Convert to fraction form
   81,870.69/112,940.21 = 47,856.95/x
3. Step 3: Cross multiply
   81,870.69x = 112,940.21 × 47,856.95
4. Step 4: Simplify right side
   81,870.69x = 5,404,974,026.03
5. Step 5: Solve for x
   x = 5,404,974,026.03/81,870.69
6. Step 6: Final answer
   x = 66,018.43