Finding the Fourth Proportional to 55,128.51, 76,075.53 and 30,928.01

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.51 : 76,075.53 = 30,928.01 : x
2. Step 2: Convert to fraction form
   55,128.51/76,075.53 = 30,928.01/x
3. Step 3: Cross multiply
   55,128.51x = 76,075.53 × 30,928.01
4. Step 4: Simplify right side
   55,128.51x = 2,352,864,372.22
5. Step 5: Solve for x
   x = 2,352,864,372.22/55,128.51
6. Step 6: Final answer
   x = 42,679.63