Finding the Fourth Proportional to 105,164.37, 145,130.27 and 57,421.35

Step by Step Solution

1. Step 1: Write the proportion equation
   105,164.37 : 145,130.27 = 57,421.35 : x
2. Step 2: Convert to fraction form
   105,164.37/145,130.27 = 57,421.35/x
3. Step 3: Cross multiply
   105,164.37x = 145,130.27 × 57,421.35
4. Step 4: Simplify right side
   105,164.37x = 8,333,575,742.16
5. Step 5: Solve for x
   x = 8,333,575,742.16/105,164.37
6. Step 6: Final answer
   x = 79,243.34