Finding the Fourth Proportional to 155,003.69, 213,890.31 and 87,005.07

Step by Step Solution

1. Step 1: Write the proportion equation
   155,003.69 : 213,890.31 = 87,005.07 : x
2. Step 2: Convert to fraction form
   155,003.69/213,890.31 = 87,005.07/x
3. Step 3: Cross multiply
   155,003.69x = 213,890.31 × 87,005.07
4. Step 4: Simplify right side
   155,003.69x = 18,609,541,393.87
5. Step 5: Solve for x
   x = 18,609,541,393.87/155,003.69
6. Step 6: Final answer
   x = 120,058.70