Finding the Fourth Proportional to 84,499.45, 126,748.83 and 21,319.72

Step by Step Solution

1. Step 1: Write the proportion equation
   84,499.45 : 126,748.83 = 21,319.72 : x
2. Step 2: Convert to fraction form
   84,499.45/126,748.83 = 21,319.72/x
3. Step 3: Cross multiply
   84,499.45x = 126,748.83 × 21,319.72
4. Step 4: Simplify right side
   84,499.45x = 2,702,249,565.93
5. Step 5: Solve for x
   x = 2,702,249,565.93/84,499.45
6. Step 6: Final answer
   x = 31,979.49