Finding the Fourth Proportional to 93,443.32, 128,968.50 and 55,720

Step by Step Solution

1. Step 1: Write the proportion equation
   93,443.32 : 128,968.50 = 55,720 : x
2. Step 2: Convert to fraction form
   93,443.32/128,968.50 = 55,720/x
3. Step 3: Cross multiply
   93,443.32x = 128,968.50 × 55,720
4. Step 4: Simplify right side
   93,443.32x = 7,186,124,820
5. Step 5: Solve for x
   x = 7,186,124,820/93,443.32
6. Step 6: Final answer
   x = 76,903.57