Finding the Fourth Proportional to 42,390.64, 58,503.76 and 27,091.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390.64 : 58,503.76 = 27,091.30 : x
2. Step 2: Convert to fraction form
   42,390.64/58,503.76 = 27,091.30/x
3. Step 3: Cross multiply
   42,390.64x = 58,503.76 × 27,091.30
4. Step 4: Simplify right side
   42,390.64x = 1,584,942,913.29
5. Step 5: Solve for x
   x = 1,584,942,913.29/42,390.64
6. Step 6: Final answer
   x = 37,388.98