Finding the Fourth Proportional to 128,345.50, 177,112.56 and 70,983.91

Step by Step Solution

1. Step 1: Write the proportion equation
   128,345.50 : 177,112.56 = 70,983.91 : x
2. Step 2: Convert to fraction form
   128,345.50/177,112.56 = 70,983.91/x
3. Step 3: Cross multiply
   128,345.50x = 177,112.56 × 70,983.91
4. Step 4: Simplify right side
   128,345.50x = 12,572,142,018.91
5. Step 5: Solve for x
   x = 12,572,142,018.91/128,345.50
6. Step 6: Final answer
   x = 97,955.46