Finding the Fourth Proportional to 35,978.77, 53,973.08 and 12,279.94

Step by Step Solution

1. Step 1: Write the proportion equation
   35,978.77 : 53,973.08 = 12,279.94 : x
2. Step 2: Convert to fraction form
   35,978.77/53,973.08 = 12,279.94/x
3. Step 3: Cross multiply
   35,978.77x = 53,973.08 × 12,279.94
4. Step 4: Simplify right side
   35,978.77x = 662,786,184.02
5. Step 5: Solve for x
   x = 662,786,184.02/35,978.77
6. Step 6: Final answer
   x = 18,421.59