Finding the Fourth Proportional to 111,271.21, 153,554.43 and 65,971.39

Step by Step Solution

1. Step 1: Write the proportion equation
   111,271.21 : 153,554.43 = 65,971.39 : x
2. Step 2: Convert to fraction form
   111,271.21/153,554.43 = 65,971.39/x
3. Step 3: Cross multiply
   111,271.21x = 153,554.43 × 65,971.39
4. Step 4: Simplify right side
   111,271.21x = 10,130,199,187.76
5. Step 5: Solve for x
   x = 10,130,199,187.76/111,271.21
6. Step 6: Final answer
   x = 91,040.61