Finding the Fourth Proportional to 165,445.69, 248,196.21 and 129,905.57

Step by Step Solution

1. Step 1: Write the proportion equation
   165,445.69 : 248,196.21 = 129,905.57 : x
2. Step 2: Convert to fraction form
   165,445.69/248,196.21 = 129,905.57/x
3. Step 3: Cross multiply
   165,445.69x = 248,196.21 × 129,905.57
4. Step 4: Simplify right side
   165,445.69x = 32,242,070,131.89
5. Step 5: Solve for x
   x = 32,242,070,131.89/165,445.69
6. Step 6: Final answer
   x = 194,880.09