Finding the Fourth Proportional to 42,117.84, 58,131.72 and 28,721.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,117.84 : 58,131.72 = 28,721.07 : x
2. Step 2: Convert to fraction form
   42,117.84/58,131.72 = 28,721.07/x
3. Step 3: Cross multiply
   42,117.84x = 58,131.72 × 28,721.07
4. Step 4: Simplify right side
   42,117.84x = 1,669,605,199.34
5. Step 5: Solve for x
   x = 1,669,605,199.34/42,117.84
6. Step 6: Final answer
   x = 39,641.28