Finding the Fourth Proportional to 99,031.78, 136,504.69 and 77,484.36

Step by Step Solution

1. Step 1: Write the proportion equation
   99,031.78 : 136,504.69 = 77,484.36 : x
2. Step 2: Convert to fraction form
   99,031.78/136,504.69 = 77,484.36/x
3. Step 3: Cross multiply
   99,031.78x = 136,504.69 × 77,484.36
4. Step 4: Simplify right side
   99,031.78x = 10,576,978,541.65
5. Step 5: Solve for x
   x = 10,576,978,541.65/99,031.78
6. Step 6: Final answer
   x = 106,803.88