Finding the Fourth Proportional to 89,421.60, 123,384.72 and 57,584.16

Step by Step Solution

1. Step 1: Write the proportion equation
   89,421.60 : 123,384.72 = 57,584.16 : x
2. Step 2: Convert to fraction form
   89,421.60/123,384.72 = 57,584.16/x
3. Step 3: Cross multiply
   89,421.60x = 123,384.72 × 57,584.16
4. Step 4: Simplify right side
   89,421.60x = 7,105,005,458.04
5. Step 5: Solve for x
   x = 7,105,005,458.04/89,421.60
6. Step 6: Final answer
   x = 79,455.14