Finding the Fourth Proportional to 90,021.12, 134,992.72 and 37,394.64

Step by Step Solution

1. Step 1: Write the proportion equation
   90,021.12 : 134,992.72 = 37,394.64 : x
2. Step 2: Convert to fraction form
   90,021.12/134,992.72 = 37,394.64/x
3. Step 3: Cross multiply
   90,021.12x = 134,992.72 × 37,394.64
4. Step 4: Simplify right side
   90,021.12x = 5,048,004,167.02
5. Step 5: Solve for x
   x = 5,048,004,167.02/90,021.12
6. Step 6: Final answer
   x = 56,075.78