Finding the Fourth Proportional to 52,312.71, 78,468.39 and 12,870.17

Step by Step Solution

1. Step 1: Write the proportion equation
   52,312.71 : 78,468.39 = 12,870.17 : x
2. Step 2: Convert to fraction form
   52,312.71/78,468.39 = 12,870.17/x
3. Step 3: Cross multiply
   52,312.71x = 78,468.39 × 12,870.17
4. Step 4: Simplify right side
   52,312.71x = 1,009,901,518.93
5. Step 5: Solve for x
   x = 1,009,901,518.93/52,312.71
6. Step 6: Final answer
   x = 19,305.09