Finding the Fourth Proportional to 52,090.79, 78,139.61 and 20,498.36

Step by Step Solution

1. Step 1: Write the proportion equation
   52,090.79 : 78,139.61 = 20,498.36 : x
2. Step 2: Convert to fraction form
   52,090.79/78,139.61 = 20,498.36/x
3. Step 3: Cross multiply
   52,090.79x = 78,139.61 × 20,498.36
4. Step 4: Simplify right side
   52,090.79x = 1,601,733,362.85
5. Step 5: Solve for x
   x = 1,601,733,362.85/52,090.79
6. Step 6: Final answer
   x = 30,748.88