Finding the Fourth Proportional to 42,387.60, 63,590.16 and 13,926.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42,387.60 : 63,590.16 = 13,926.70 : x
2. Step 2: Convert to fraction form
   42,387.60/63,590.16 = 13,926.70/x
3. Step 3: Cross multiply
   42,387.60x = 63,590.16 × 13,926.70
4. Step 4: Simplify right side
   42,387.60x = 885,601,081.27
5. Step 5: Solve for x
   x = 885,601,081.27/42,387.60
6. Step 6: Final answer
   x = 20,892.93