Finding the Fourth Proportional to 128,667.16, 177,612.78 and 83,384.01

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.16 : 177,612.78 = 83,384.01 : x
2. Step 2: Convert to fraction form
   128,667.16/177,612.78 = 83,384.01/x
3. Step 3: Cross multiply
   128,667.16x = 177,612.78 × 83,384.01
4. Step 4: Simplify right side
   128,667.16x = 14,810,065,823.65
5. Step 5: Solve for x
   x = 14,810,065,823.65/128,667.16
6. Step 6: Final answer
   x = 115,103.70