Finding the Fourth Proportional to 105,090.21, 145,027.69 and 59,774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,090.21 : 145,027.69 = 59,774.72 : x
2. Step 2: Convert to fraction form
   105,090.21/145,027.69 = 59,774.72/x
3. Step 3: Cross multiply
   105,090.21x = 145,027.69 × 59,774.72
4. Step 4: Simplify right side
   105,090.21x = 8,668,988,687.42
5. Step 5: Solve for x
   x = 8,668,988,687.42/105,090.21
6. Step 6: Final answer
   x = 82,490.93