Finding the Fourth Proportional to 72,335.70, 99,820.35 and 42,121.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,335.70 : 99,820.35 = 42,121.89 : x
2. Step 2: Convert to fraction form
   72,335.70/99,820.35 = 42,121.89/x
3. Step 3: Cross multiply
   72,335.70x = 99,820.35 × 42,121.89
4. Step 4: Simplify right side
   72,335.70x = 4,204,621,802.46
5. Step 5: Solve for x
   x = 4,204,621,802.46/72,335.70
6. Step 6: Final answer
   x = 58,126.51