Finding the Fourth Proportional to 128,637.32, 177,520.01 and 72,048.69

Step by Step Solution

1. Step 1: Write the proportion equation
   128,637.32 : 177,520.01 = 72,048.69 : x
2. Step 2: Convert to fraction form
   128,637.32/177,520.01 = 72,048.69/x
3. Step 3: Cross multiply
   128,637.32x = 177,520.01 × 72,048.69
4. Step 4: Simplify right side
   128,637.32x = 12,790,083,809.04
5. Step 5: Solve for x
   x = 12,790,083,809.04/128,637.32
6. Step 6: Final answer
   x = 99,427.48