Finding the Fourth Proportional to 103,421.34, 142,721.37 and 58,709.34

Step by Step Solution

1. Step 1: Write the proportion equation
   103,421.34 : 142,721.37 = 58,709.34 : x
2. Step 2: Convert to fraction form
   103,421.34/142,721.37 = 58,709.34/x
3. Step 3: Cross multiply
   103,421.34x = 142,721.37 × 58,709.34
4. Step 4: Simplify right side
   103,421.34x = 8,379,077,436.60
5. Step 5: Solve for x
   x = 8,379,077,436.60/103,421.34
6. Step 6: Final answer
   x = 81,018.84