Finding the Fourth Proportional to 112,648.80, 155,458.80 and 64,911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112,648.80 : 155,458.80 = 64,911.72 : x
2. Step 2: Convert to fraction form
   112,648.80/155,458.80 = 64,911.72/x
3. Step 3: Cross multiply
   112,648.80x = 155,458.80 × 64,911.72
4. Step 4: Simplify right side
   112,648.80x = 10,091,098,097.14
5. Step 5: Solve for x
   x = 10,091,098,097.14/112,648.80
6. Step 6: Final answer
   x = 89,580.17