Finding the Fourth Proportional to 128,019.43, 176,666.71 and 71,430.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,019.43 : 176,666.71 = 71,430.81 : x
2. Step 2: Convert to fraction form
   128,019.43/176,666.71 = 71,430.81/x
3. Step 3: Cross multiply
   128,019.43x = 176,666.71 × 71,430.81
4. Step 4: Simplify right side
   128,019.43x = 12,619,446,195.34
5. Step 5: Solve for x
   x = 12,619,446,195.34/128,019.43
6. Step 6: Final answer
   x = 98,574.46