Finding the Fourth Proportional to 52,420.98, 78,561.42 and 19,109.76

Step by Step Solution

1. Step 1: Write the proportion equation
   52,420.98 : 78,561.42 = 19,109.76 : x
2. Step 2: Convert to fraction form
   52,420.98/78,561.42 = 19,109.76/x
3. Step 3: Cross multiply
   52,420.98x = 78,561.42 × 19,109.76
4. Step 4: Simplify right side
   52,420.98x = 1,501,289,881.46
5. Step 5: Solve for x
   x = 1,501,289,881.46/52,420.98
6. Step 6: Final answer
   x = 28,639.10