Finding the Fourth Proportional to 100,698.39, 138,955.91 and 58,248.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,698.39 : 138,955.91 = 58,248.72 : x
2. Step 2: Convert to fraction form
   100,698.39/138,955.91 = 58,248.72/x
3. Step 3: Cross multiply
   100,698.39x = 138,955.91 × 58,248.72
4. Step 4: Simplify right side
   100,698.39x = 8,094,003,602.69
5. Step 5: Solve for x
   x = 8,094,003,602.69/100,698.39
6. Step 6: Final answer
   x = 80,378.68