Finding the Fourth Proportional to 112,856.78, 155,792.48 and 72,074.31

Step by Step Solution

1. Step 1: Write the proportion equation
   112,856.78 : 155,792.48 = 72,074.31 : x
2. Step 2: Convert to fraction form
   112,856.78/155,792.48 = 72,074.31/x
3. Step 3: Cross multiply
   112,856.78x = 155,792.48 × 72,074.31
4. Step 4: Simplify right side
   112,856.78x = 11,228,635,679.37
5. Step 5: Solve for x
   x = 11,228,635,679.37/112,856.78
6. Step 6: Final answer
   x = 99,494.56