Finding the Fourth Proportional to 112,875.36, 155,768.60 and 65,130.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112,875.36 : 155,768.60 = 65,130.72 : x
2. Step 2: Convert to fraction form
   112,875.36/155,768.60 = 65,130.72/x
3. Step 3: Cross multiply
   112,875.36x = 155,768.60 × 65,130.72
4. Step 4: Simplify right side
   112,875.36x = 10,145,321,071.39
5. Step 5: Solve for x
   x = 10,145,321,071.39/112,875.36
6. Step 6: Final answer
   x = 89,880.74