Finding the Fourth Proportional to 85,983.40, 128,980.86 and 30,564.52

Step by Step Solution

1. Step 1: Write the proportion equation
   85,983.40 : 128,980.86 = 30,564.52 : x
2. Step 2: Convert to fraction form
   85,983.40/128,980.86 = 30,564.52/x
3. Step 3: Cross multiply
   85,983.40x = 128,980.86 × 30,564.52
4. Step 4: Simplify right side
   85,983.40x = 3,942,238,075.09
5. Step 5: Solve for x
   x = 3,942,238,075.09/85,983.40
6. Step 6: Final answer
   x = 45,848.83