Finding the Fourth Proportional to 189,196.02, 261,128.34 and 108,678.78

Step by Step Solution

1. Step 1: Write the proportion equation
   189,196.02 : 261,128.34 = 108,678.78 : x
2. Step 2: Convert to fraction form
   189,196.02/261,128.34 = 108,678.78/x
3. Step 3: Cross multiply
   189,196.02x = 261,128.34 × 108,678.78
4. Step 4: Simplify right side
   189,196.02x = 28,379,109,414.63
5. Step 5: Solve for x
   x = 28,379,109,414.63/189,196.02
6. Step 6: Final answer
   x = 149,998.45