Finding the Fourth Proportional to 31,131.06, 42,970.06 and 21,702.66

Step by Step Solution

1. Step 1: Write the proportion equation
   31,131.06 : 42,970.06 = 21,702.66 : x
2. Step 2: Convert to fraction form
   31,131.06/42,970.06 = 21,702.66/x
3. Step 3: Cross multiply
   31,131.06x = 42,970.06 × 21,702.66
4. Step 4: Simplify right side
   31,131.06x = 932,564,602.36
5. Step 5: Solve for x
   x = 932,564,602.36/31,131.06
6. Step 6: Final answer
   x = 29,956.08