Finding the Fourth Proportional to 136,644, 188,568.72 and 77,028

Step by Step Solution

1. Step 1: Write the proportion equation
   136,644 : 188,568.72 = 77,028 : x
2. Step 2: Convert to fraction form
   136,644/188,568.72 = 77,028/x
3. Step 3: Cross multiply
   136,644x = 188,568.72 × 77,028
4. Step 4: Simplify right side
   136,644x = 14,525,071,364.16
5. Step 5: Solve for x
   x = 14,525,071,364.16/136,644
6. Step 6: Final answer
   x = 106,298.64